© # -*- coding: utf-8 -*- © © # in Python, there's a special type of © # data structure called keyed list. it © # is a unordered list of pairs, each © # consists of a key and a value. It is © # also known as dictionary. © © # define a keyed list © aa = {'john':3, 'mary':4, 'jane':5, 'vicky':7} © print aa © © # getting value from a key © print 'mary is', aa['mary'] © © # delete an entry © del aa['vicky'] © print aa © © # get just the keys © print aa.keys() © © # check if a key exists © print aa.has_key('mary') © © # to learn more, © # type help() and DICTIONARIES © # or see © # http://python.org/doc/2.3.4/tut/node7.html © © ------------------------------------------- © # in perl, keyed-list is done like this: © © %a = ('john',3, 'mary', 4, 'jane', 5, 'vicky',7); © use Data::Dumper qw(Dumper); © print Dumper \%a; © © # the syntax of keyed list in Perl is too complex © # to be covered in a short message. © # see "perldoc perldata" for an unix-styled course. © © Xah © [EMAIL PROTECTED] © http://xahlee.org/PageTwo_dir/more.html
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